Champ

Cha Tae-hyun

as

Seung-ho

Su-jeong Kim

as

Ye-seung

Yu Oh-seong

as

Trainer Yoon

Park Ha-seon

as

Yoon-Hee

Yoon Hee-seok

as

In-Kwon

Ahn Seo-hyun

as

Little girl

Baek Yoon-sik

Lee Jeong-woo

as

Geek